Machine parts polishing tool



' Filed Nov. 17, 1949 Nm.25,1952 A W,E JOHNSON 2,618,915

MACHIN PARTS POLISHING TOOL INVENTOR.

Willigm E. Johnson ATTORNEYS.

Nov. ,25, 1952 w. E. JOHNSON MACHINE: PARTS PQLISHING TooL 2 SHEETS- SHEET 2 Y Filed Nov. 17, 1949 INVVENTOR. William E. Johnson ATTORN EIYS.

Patented Nov. 25, 1952 UNITED STATES PATENT FFICEv MACHINE PARTS POLISHING '1300LA William E; Johnsoni Beebe; Ark;-

Application November 17, 194B,. S erial,No, 127,830

2 Claims.

Thisl invention relatesr to devicesto dress machine; parts and more specifically to hand tools to polish machine and like parts, such as have, for.: example;v substantially circular transverse crosssections. Anexample of such a part is the crank-pir!` ofa crankshaft. However, the use of the'new tool is wider, since it may be employed on journals; generally or, infact, wherever a relatively-e slender.; object, capable of being rotated, requires polishing.

An;important'object of the invention is to `provideahand tool having means to automatically adjust-crit the dressing means of the tool to the peripheral contourof the part being dressed.

Anothervimporta-ntobject is to provide a tool, asdescribedwhich will t the contour, for example,` of a crank pin over-nearly 360 of the pins circumference:

Aifurther, important object is to provide a hand tool,v including,hand-grippedmeans so associated withv the; otherl means of thenew tool that the operator will-beable to quickly sense, the extent offtheI pressure of the dressing means against the periphery of the part beingdressed.

Furthermore, a very important object is to providea. tool which may be (and generally is) employed on the machine parts being dressed while thevmachine is in operation. That is, there is no time-consuming stopping and restarting of the machine during dressing operations.

A defect of tools'adapted to polish rotating machinepartsfand employing flexible supports for thedressing means is, that the flexible means is inclined to roll or bunch when the tool is in use.

An object of. this invention is to provide means towreleasablyl grip and carry the flexible support ofY this-new tool in such a way that rolling up of the flexible support is eliminated.

Anotherfobject is to provide a tool as described which isadaptedto dress machine and like parts rotating either clockwisefor counterclockwise.

In-addition,` the new tool is adapted to polish journals Without removing steady rests from the machines.

Compared with the conventional hand polishing method, employing seesaw motions, the new tool will polish a crankshaft in substantially onethirdl the time required for the conventional method.

Other; objects-and advantages of the invention will be apparent during the course of the following.; detailed-1 description of the invention, taken inconnection with thev accompanying drawing, forming aportion.offthisrdisclosure; and inwhich drawing:

Fig.r 1 is-a side elevation of the new tool in use.

Fig. 2 is an enlarged forward end elevation of the newtool in position to grasp a machine part.

Fig. 3 is a section ofjthe new tool substantially on the line 3-3 of Fig. 2.

Fig. 4 is a fragmentary` longitudinal section throughV theA hand,` gripped mea-ns; and adjusting means-therefor, ofthe newtool' Fig. 5 is an enlargedtransverse section substantially on the line- 5-5 of Fig. 1.

Fig. 6 is an enlarged fragmentaryr transverse section substantially-on the line 6 6 of Fig; 1'.

Fig. '7 is a side elevation ofv` a second form of the new tool in use.

Fig. 8 is a forward end elevation of thetool of Fig.` 7 in position to grasp a machine part.

Fig. 9 isa fragmentary longitudinal section of the forward end of the tool of, Figs. 7 and 8.

In the drawings, wherein for the purpose of illustrationare shown two forms of the invention andwherein similar reference characters designate correspondingparts throughout the several views, the letter A designates one form of the new tool; B` designatesa partwhich may be dressed by the new tool,.and C- designates a second form of the new tool.

The new tool A comprises a` support structure Dgrprovided with hand-gripped means E, and associated with means Ftc adjust the extent of movement ofthemeans E, means G to back and automatically adjust a dressingmeansH to the peripheral contour of the part B, Iand means K to detachably connect" the means H to the support structure D.

It; isgpreferredtoprovide the support structure D o f metal, such as iron or steel, and this structure includes a supportsection I0,A which may be an elongated. substantially straightrod or tube having a rear endor handle portion Il, which constitutes a part of the hand-gripped. means E, while the supports forward end portion l2 is provided with and supports a rst depending. shoe section I4 which,may` be a rigid. metallic strap, welded atV one edgeportion tothe extremity. of

. the., forward end portion I2. IntermediateA its end.V portions, the support sectionV l0, is provided with a pivot. accommodating, transverse opening 15,:and between -thisopeningfand-the forwardend portion- I 2., there isa-second pivot-accommodating transverse opening I 6v with# the axes. of the openingsfin substantial parallelism.,

A further-part ofthe support structureel) 0.0mprises a second depending shoe sectionI Il. which may be i a4 substantiallyrigidt metalstrap Ahaving r hurcaied; upperfend to provideftwoa ears.- I8

each having an outermost pivot-accommodating opening I9 and an innermost pivot-accommodating opening 20, with a pivot 2| such as a pin, extending through the openings I6 and 20, whereby the shoe section I1 is supported by the support section I and may swing toward and away from the shoe section I4, which it faces. It will be noted that the shoe section I4 is partly curved so that it forms substantially a J in transverse section. j

Pivotally carried bv the support section I0 is another portion of the hand-gripped means E and comprising a suitable handle portioneZ 5, having a rear hand-grip 26 suitably shaped to conform to the contour of the palm of the'operators hand, and bifurcated adjacent its forward end to provide two ears 21 having aligning perforations to accommodate a pivot pin 28 which also extends through the opening I5, whereby the portion25 is rockably mounted upon the section Ill.V Outwardly of theY perforations last mentioned are a pair of axially aligned perforations 29 forV a purpose next detailed.

'Ihe means F to adjust the extent of movement of'the hand-gripped means E preferablyY comprises'a substantially straight metallic rod 30 having one screw threaded end 3 I, and the opposite end provided with an enlargement 32 having a circular periphery. The screw threaded end 3l extends into the screw-threaded bore 33 of a pivotedeirst member 34 carried by a pivot pin 35 `extending through the openings I9 and opening in the member 34, the one end portion thereof opposite the end portion containing the bore 33. The enlargement 32 is rotatably accommodated Yin a pivoted second member 35 which is provided with, a -socket for the enlargement 32 extending from one end portion thereof and the wall at the mouth of the socket may be peened to retain theenlargement. The opposite end portion of theV member 3B is pivoted to the ears 26 by a pin Y31 extending through the perforations 29 and an axially-aligning perforation in the member 36.V By rotating the rod 30 in one direction, the screw threaded end thereof will be fed into the socket ofthe member 34 thus shortening the distance between the two members 34 and 36 and raising the handle portion 25 so that its effective throw will be greater, or rotating the rod 30 in the other direction will have the opposite effect upon the handle portion 25.

The means G to back and automatically adjust the dressing means H to the peripheral contour of the part B, comprises a, sheet or length of flexible material, as leather, having a Width preferably substantially that of the shoe sections I4 and I1 and a length suicient to extend substantially completely around the part B, and having portions 40. rThis. sheet arches from one shoe Vto Ythe other.

vsheet constituting the means H may be secured at its end portions 40 to the shoe sections I4 and I1 by at least two spaced-apart rivets 44, so that it arches from one shoe to the other,

"preferably in contact with the sheet of the means Gl K Means Kto detachably grip the means H and connect the means G to the support structure D includes a plate or retaining member with one end portion 5I thereof curved to extend over the lower or free edge of the rst shoe section I4 but spaced therefrom since preferably one end portion of the sheet of the means H is extended over this free edge and over the outer face of the lower portion of this shoe and the main portion of the member 50 parallels this lower portion. Means to clamp this'member 50 in position as described may be at least two spaced-apart screws 53 with their shanks extending through suitable openings in the member 50 and one end portion of the sheet of the means H and into screw-threaded sockets 54 in the shoel4. Similarly, a second plate or retaining member 55 is provided,rcurved to the contour of the free end portion of the shoe section I1 and having a lower end portion 56 arranged similarly to that of the end portion 5I. Screws 51 (at least a pair of spaced-apart screws) are employed similarly to the screws 53 and the free end portions of their Shanks extend into sockets, similar to the sockets 54 in the shoe section I 1. Y

From the foregoing itis now apparent that, since the means H is removable by removing the screws 53 and 51 and retaining members 50 and 55 these sheets may be readily renewed yet, when heldrby the means K and backed by the means H, it will not tear loose nor creep or bunch. When the means H is in place, the operator, with the shoe portion I1 spread away from the shoe portion I4, extends the tool A with the means G and H over the part B and then presses down on the handle portion II which causes the means G and H to Wrap around the part B substantially as in Fig. 1. With the part B rotating, the abrasive of the means G will dress or polish the periphery of the part B without the necessity of the operator swinging the tool in an arc.

Referring now to Figures '7, 8 and 9, the form C of the invention preferably comprises a support structure L, provided with hand gripping means which is preferably exactly like the hand gripping means E, means to adjust the extent of movement of the means E, preferably exactly like the means F, dressing means M, means N to support a supply of the means M, and means P to detachably connect the means M to the support structure L.

The support structure L is preferably of metal, such as iron or steel and includes a support section 60 which is much like the section I0 and has a handle portion exactly like the handle portion Il, while the support section 6I) has a forward end portion 6I provided with a depending rigid rst shoe section 62 preferably formed of a curved continuation of the section 6B, and having a curved or rounded free end. Intermediate its end portions, the support structure 30 is provided with opening just like the openings I5 and I6.

An additional part of the support structure L comprises a second depending shoe section 63 which may be a substantially rigid metal strap with a rounded or curved free lower end and having a bifurcated upper end to provide ears like the ears I3 with openings, like the openings I9 and 20, and with a pivot pin, like the pivot 2|,

serving the same purpose as the latter. The shoe section 63 is partly curved, like the shoe section I1 so that it, too, forms substantially a J in transverse section.

The shoe section B2 adjacent its free end is provided with a guide means 64 for the dressing means M and this guide means may be a pair of paralleling arms, secured at one end of each to 5 the outer face of the shoe section 62 and connested at` their other ends by a substantially straightV bar porti-on paralleling the adjacent shoe face and employed Aas hereinafter detailed,

The dressing means M-ispreferably in the form of an elongated sheet. or length of flexible material fhaving a polishing or an abrasive-carrying outer face, with suitable material thereon for dressing `the part B, and this material suitably attached to a backing of tough flexible material, as fabric. The sheet or length is preferably supplied in rolls, as at 65.

Means N to support a supply of the means M is shown as an elongated, longitudinally slotted cylinder 'l0 of springy material, preferably metal, as springy steel, which is mounted upon the shoe section 62 intermediate its ends and held in place by an inverted L-shaped bracket 'H extending outwardly and upwardly from the shoe section 62, with one arm 12 of the latter soldered or welded to the section 62 and the other arm 13 carrying a screw threaded perforation to accommodate a set screw 'M the free end of which bears against the outer face of the cylinder l spaced from the slot 15 thereof so that tightening of this screw against the cylinder will distort the latter and cause it to grip the roll 65 when the roll is large and also cause the walls of the slot 15 to move into gripping relationship with the material, preventing rotation thereof but, when the screw is rotated to allow the cylinder to resume its original shape, the roll may be manually rotated to feed its material through the slot 15.

From the slot 15 the material forming the means M is fed between th-e bar portion of the guide means 64 and the face of the shoe section 62 then over the curved or rounded lower free end of the latter, upwardly and around in a loop, as is the dressing means H, and then over the rounded lower or free end of the shoe section 63 and upwardly a short distance over its outer face.

Means P to detachably connect the means M to the shoe lsection 63 of the support structure L may comprise plate or retaining member Sil curved to fit over (but spaced from) the curved or rounded edge and the adjacent outer face of the free end portion of the shoe section 63, with the free end of the material of the means M gripped between the shoe section 63 and the member 8D. A pair of spaced-apart screws 8l with their shanks extending through suitable perforations in the member 85 through the material of the means M and into screw-threaded openings in the shoe section 62 are adapted to retain the member 8!! in place to grip the adjacent material of the means M.

The means M of the form C may be readily renewed when used up by slipping a new roll into the cylinder 'It and threading it into place. Of course, having this renewable supply of the means M at hand is time saving, as is now obvious.

The tool of the form C is manipulated to dress a part B exactly like the tool of the form A, the major difference being in the elimination of the means K of the form A in the form C and the addition to form C of the means N.

It will be noted that the two portions of the lengths constituting the means H, where they extend over the free edges of the shoe sections do not ever contact each other, to quickly wear down each other due to vibrations, since they are protected by the curved end portions l and 55 of the members 50 and 55 respectively.

Because the means G, H and 'M are flexible sheets, the operator, while using the tool, will quickly learn to feeL throughhis hand grasping the handle portions l and 25, ,the extent of pressure of the means H or M upon the periphery of the part B, and can vary the pressure. This feel is not possible where fiexible means similar to my means G, H or M are not employed.

Because the means G is secured to the shoes I4 and Il as described,-and the means H' is also secured thereto as described and positioned as it is with reference to the sheet of the means G, and the means M secured as described, the lengths of the means H or M will not be apt to creep, bunch nor rock when dressing the machine part.

Various changes may be made to theforrns of the invention herein shown and described without departing from the spirit of the invention or scope of the claims.

What is claimed is:

l. In a crank pin polishing tool a first shoe, a second shoe, with both of said shoes having opposite faces, a support, means supporting one of said shoes from said support, means supporting the other of said shoes from said support spaced from and facing the rst shoe, means for oscillating at least one of said shoes toward and away from the other shoe, a length of flexible material, provided with polishing material upon one of its faces, means securing the free end portion of said length to one of said shoes with a portion of the material inwardly of said free end arching rom one shoe to the other shoe and with said one of said faces of said length of material outermost, means housing the other end portion of said length of flexible material with said other end portion in a roll, comprising an elongated cylinder of springy material carried by the other of said shoes and provided with a longitudinally-extending slot through which a portion of said length, adjacent said roll, extends, and means for moving one wall of said slot toward the opposite wall thereof to releasably grip said portion of said length extending through said slot.

2. In a crank pin polishing tool, a first shoe, a second shoe, with both of said shoes having opposite faces, a support, means rigidly supporting the rst shoe from said support, means pivotally supporting the second shoe from said support, spaced from the first shoe, means for oscillating the second shoe toward and away from the first shoe, a length of flexible material, provided with polishing material upon a face thereof, means securing one end portion of said length to one of said shoes, with a portion of said length inwardly of said free end arching in the space between said shoes and extending from one shoe to the other shoe, and with said face outermost, means housing the other end portion of said length with said other end portion in a roll, comprising a cylinder of springy material about said roll and provided with a slot extending from end to end of said cylinder and with a portion of said length, adjacent said roll extending through said slot, bracket means extending about a portion of said cylinder, including a rigid bracket portion, and means for moving one wall of said slot toward the other wall thereof to releasably grip said portion of said length extending through said slot, comprising a set screw rotatably carried by said bracket portion and with the shank of said screw bearing against said cylinder adjacent said slot.

WILLIAM E. JOHNSON.

(References on following page) REFERENCES CITED Number The following referenczes are of record in the 1,908,048

le of this patent: 2,376,531

Y UNITED STATES PATENTS Number Name Dai-,e Number 1,025,859 Calahan May 7, 1912 24,277 1,565,958 Reno Dec, 15, 1925 158,777 1,622,292 Reno Mar, 29, 1927 169,975 1,748,313 Steuber F811 25, 1930 10 389,638

Dunbar et a1 Apr, 25, 1933 V8 n Name .Date Player et a1. May 9, 1933 Egger May 22, 1945 FOREIGN PATENTS Country Date Great Britain Nov. 6, 1902 Germany May 22, 1904 Germany Apr. 18, 1906 France Sept. 14, 1908 

